Power-transmitting mechanism.



No. 886,778." PATENTED MAY 5, 1908.

R. H. DUNLAP. POWER TRANSMITTING MECHANISM.

APPLICATION FILED 13150.13. 1907.

Ill

Wit" emu ROBERT HENRY DUNLAP, OF THE UNITED STATES MARINE CORPS.

POWER-TRANSMITTING MECHANISM.

Specification of Letters Patent.

Patented May 5, 190a.

' Application filed December 13, 1907. Serial No. 406,265;

To all whom it may concern:

Be it known that I, ROBERT HENRY DUN- LAP, a citizen of the United States, captain United States Marine Corps, have made a certain new and useful Invention in Power-.

Transmitting Mechanism; and I declare the following-t0 be afull, clear, and exact description of the same, such as will enable others skilled in the art to which it apper- Figure 1 1s a side view of the invention the position of the cam wheel turned one half around being shown in dottedlines. Fig. 2

is a central longitudinal sectionof the invention with the parts thereof inthe positions shown in Fig. 1. Fig. 3 is a section on the line 3-3, Fig. 2. Fig. 4 is a detail face view of the-wheel having the cam track or groove. Fig. 5 is a detail view of the inner member of the cover or face plate. Fig. 6 is a similar view of the outer member of such plate.

The invention relates to power transmitting mechanism having for its object the provision of improved means whereby the power transmission will be gradualand without shock or jar, and whereby any desired variation or degree of speed up to the full speed of the driving member may be reached, all in a practical and simple manner.

Other objects and advantages will hereinafter appear.

In the accompanying drawings, illustrat ing the invention, the letter a, designates the driving member having a shaft a, 'andl), is

the driven member having a shaft 1;, iiifilinc with the shaft of the driving member, the ends of such shafts having an opposing rela- Upon the end of the shaft a, is secured to turn therewith a wheel 0, arranged as shown at an angle of sixty degrees to the shaft and having in its inner face.

an annular cam track or groove 01, of concave character, the transverse elements of such groove being semi-circular. Upon the end. of the shaft 1), 18 secured in a fast manner to turn therewith a cylindrical head e, having at diametrically opposite points cylinder chamhers f, and f formed therein,'the outer ends of such chambers being open and the inner ends thereof being connected by a transverse port or passageway g.

Fitting in the cylinder chambers f, and f,

are pistons h, and h, having globular or ballform heads 71?, which are seated in the annular cam'track or groove cl, at diametrically opposite points thereof, a cover or face plate composed of an annular outer member and a circular inner member being used to prevent escape of the ball heads of the pistons-from the cam track or runway, the members of such plate havingthe opposing edges thereof suitably formed to'closely engage a narrow zone of the ball heads. way g, and the unoccupied portion or portions of the cylinder chambers is com letely filled with a suitable liquid such as g ycerin or oil, a needle valve i, fitting centrally within the shaft 1), which is bored. out for this purpose, being employed to control the )assage of the liquid aforesaid from one half of the passageway to the other. The face of the wheel 2;, at one side thereof is arranged closely adjacent to the head e, and the pistons or plungers have such length that at one point in the reciprocation of each the cylinder is completely occupied thereby, when the opposite piston will occupy about one half of its cylinder. 1

Upon rotation of the driving member a, the wheel a, turning therewith will, if the port 9, be entirely open, freely reciprocate the plungers in the cylinders, the ball heads of the plungers sliding in the cam groove or runway' and the driven member remaining at rest. Should the valve in the port be entirely closed the pistons will not reciprocate at all andthe driven member will rotate at The port or passagethe full speed of the driving member. Bc-

without shock or jar in making such changes M which will takeplace gradually.

' Acentral oil reservoir j, is arranged in the head e, such reservoir communicating with the portg, at the central portion thereof by an'opening 7c, in the wall'ic, between reser voir and port, this opening being in line with the needle valve, which enters this opening and also the reservoir.

Having described the invention, what I space for liqui .the pistons in the ,confinlng space for liquids, an

52mins ha said elements claim and desire to secure by Letters Patent is: t

1. A drivingl element, a driven element, aving respectively a pair of parallel pistons and parallel o positely-arranged cylinders e aged there y the front and rear ends of sai cylinders being located at the corresponding ends of the element in which they are located, said cylinders having a connectinggassage toform a confining said driving element being adapted to cause op osite reciprocation-0f cy ders, and. a valve. in said passage.

2. A driving element including an inclined wheel having an annular cam track,

ven shaft aving a head provided with cylinders engaged by said pistons, and a pasnection with said sageway connecting said cylinders, and a va ve in said passageway.

4. A driving shaft aving an inclined Wheel provided with an annular inclosed track, and dparallel pistons having heads en- 1gaging sai track, a driven shaft having a ead provided with cylinders engaged by said lstons, a passageway connecting said cylin ers, and an oil reservoir having conpassageway, and a valve in said passagewa I 5. A driving element, a driven'element,

said. elements having respectively parallel pistons and parallel oppositely arranged cylends of sai corresponding ends of the e ement in which mders enga ed thereby the front and rear cylinders bein located at the they are arranged, said cylinders having a connectin passageway to form a confining space for quid, said'driving element being.

ada ted to causeyop osite reciprocation of em pistons, and a va ve In said passageway.

in presence of two witnesses.

ROBERT HENRY D Witnesses:

GEORGE M. ANDERSON, HERBERT C. EMERY.

NLAP.

.50 In testimony whereof I afiix my signature, 

